THE PRESSURE GUAGE RISES TO 3BAR AND WATER COMES OUT THE OVERFLOW CONTINUALY ONLY STOPS WHEN I TURN OFF THE COLD WATER AT THE MAINS.THE BOILER IS NOT ON.
I ALSO HAVE A LEAK IN THE HOT WATER TANK AND I AM WAITING FOR IT TO BE REPLACED IS THIS JUST A COINSIDENCE OR ARE THE 2 RELATED ? IT IS A PRESSURISED SYSTEM .

IAN, July 2009

check the filling loop is shut fully and not passing water.
if the filling loop is ok the it sounds like the h/exchanger.

hi-spec plumbing & heating (essex), July 2009